Do not trim metric names.
Do not trim metric names.

Previously, metric names where trimmed before insertion in the DB.
However, such names were not trimmed when inserted in the internal
metric ID cache. This caused issues when the cache got rebuild from
the DB and metric names didn't match. The storage engine then tried
to reinsert the existing metric but failed because of the UNIQUE on
index_id-metric_name. This fixes #3628.

git-svn-id: a49aa41e49c69a6ab6ef43f172843a2fef6cb475@1229 7c7d615a-03b3-410d-a316-1135b1bd9499

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